Ah yes you're correct. Fibonacci heap's aren't usually used in most applications of dijkstra's algorithm (such as road networks) though because trading an O(logn) heap.decrease_key operation for an O(1) heap.decrease_key operation, but getting a slower heap.delete_min operation (by a constant factor) isn't worth it.

This is because there are much fewer heap.decrease_key operations on average than Dijkstra's worst case analysis suggests. The expected number of heap.decrease_key operations is not large enough to offset the loss in average runtime for the heap.delete_min operation.